Spark-arrester.



D No. 880,385. PATENTED FEB. 25, 1908.,

w. r. MAGG'REGOR.

SPARK ARRESTER.

APPLICATION FILED JULY 17, 1905.

r": Nunms Psrnzs co..wasnmarou, 0. c4

pended claims.

UNITED STATES PATENT OFFICE.

WALLACE F. MACGREGOR, OF RAOINE, WISCONSIN, ASSIGNOR TO I. I. CASE THRESHING MACHINE COMPANY, OF RAGINE, WISCONSIN, A CORPORATION.

SPARK-ARRESTER.

Specification of Letters Patent.

Patented Feb. 25, 1908.

Application filed July 1'7. 1905- Scrial No. 270.013.

T 0 all whom it may concern:

Be it known that I, VVALLAOE F. MAG- GREGOR, a citizen of the United States, and a resident of Racine, county of Racine, and State of Wisconsin, have invented certain new and useful Improvements in Spark-Arresters, of which the following is declared to be a full, clear, and exact description.

The invention relates to spark arresters for traction and like engines and seeks to provide simple and effective means by which the spark arresting screen may be adjusted within the stack.

The invention consists in the features of construction, combinations and arrangements of parts hereinafter set forth, illustrated in the accompanying drawing and more particularly pointed out in the ap- In the drawlngs, Figure 1 is a vertical section of the stack and spark arrester with the improved adjusting devices applied thereto. Fig. 2 is a plan view. Fig. 3 is a detail sec tion on line 3-3 of Fig. 1. Fig. 4 is a detail section on line 4-4 of Fig. 1. Fig. 5 is a detail section on line 5-5 of Fig. 13, showing the parts in raised position. Fig. 6 is an enlarged view of certain parts shown in Fig. 3 in raised position.

The stack 10 mounted upon the front end of the boiler 11 may be of any suitable-or de-.

sired shape and is preferably formed of cast iron. At its lower end, the stack is provided with a flange 12 having holes 13 through which the bolts extend for holding the stack in place. At its upper end the stack is provided with an outwardly projecting hollow flanged portion 14 forming an annular chamber for collecting cinders. The inverted cone screen 15 hangs centrally within the stack and is connected at its upper end to a ring frame 16 of substantially the same size as the upper end of the stack, and arranged to rest thereon when the screen is in its lowermost position. The screen deflects the hot cinders and sparks into the annular chamber 14 and the latter is provided at one point with a downwardly projecting nozzle 17 leading into a suitable receptacle 18, secured in place upon the front of the stack by a bolt 19. The bottom 20 of the receptacle 18 is hinged so that the collected cinders may be discharged. Normally the bottom 20 is held in place by a suitable catch 21. The chamber 14 is provided at its lower edge with an upwardly extending flange 22 that prevents the cinders or sparks collected in the chamber from being drawn into the blast through the stack.

It is often desirable to raise the cone screen within the stack to a greater or less extent in accordance with the circumstances under which the traction engine is working, since the draft through the engine boiler is thereby improved. The same necessity does not always exist for arresting all sparks and cinders, but even in the raised position of the screen it will deflect the greater part of the sparks and hot cinders and prevent them from being blown to any great distance.

The ring frame 16 is provided on one side with a bracket 23 (see Figs. 1 and 2), which is cast in piece or otherwise secured to the ring and is provided with a square sleeve 24 to receive the upper end of the square shifter rod 25. A set screw 26 securely connects the ring frame to the upper end of the shifter rod. The flanged portion 14 at the upper end of the stack serves as guiding means for the shifting rod, and for this purpose is provided with square openings 27 (see Fig. 4), through which the rod 25 extends. The rod quite snugly fits these openings so that it is accurately guided in its vertical shift, but is held against rotation so that the screen 15 is always held in line with the center of the stack.

The lower end of the rod sets within a ey lindrical socket in the upper end of a handlepiece 28. The lower reduced portion 29 of the handle-piece extends through an opening in the end of a bracket 30 that is secured to the flange 12 of the stack by a bolt 31. The handle-piece 28 is provided with alaterally projecting portion 32 that may be conveniently gripped to raise and lower the shifter rod and screen. In its lowermost position, the upper and large portion of the handle piece 28 rests upon the end of the bracket 30.

The reduced portion 29 of the handle is seats by simply turning the handle.

It should be noted that the end'piece 29 forms in effect an extension of the shifter rod and that the bracket 30 on the side of the stack and the flange 14 at the upper end of the stack form guiding means for the shifter rod which are spaced apart to compel the movement of the rod in straight line direction.

It is obvious that numerous changes may be made in the details of structure without departure from the essentials of the invention. For instance, the cone screen 15 may be inverted and placed in position on the stack 10 with the apex of the cone screen upward by simply loosening set-screw 26, withdrawing the square sleeve 24 of ring frame 16 from the shifter rod 25, invertin the cone screen and its attached parts, an replacing square sleeve 24 in engagement with shifter rod 25 with the opposite edge of the ring frame 16 resting on the stack 10.

Having described my invention what I claim as new and desire to secure by Letters Patent is 1. In spark arresters, the combination with the stack and with the screen adjustable therein, of a ring frame secured to said screen, a shifter rod secured at its upper end to one side of said ring frame,fixed guides at the side of the stack for said shifter rod, said guides being spaced apart to com el the movement of sald rod in straight line irection, a handle at the lower end of said rod and means for holding said rod and screen in a plurality of adjusted positions, substantially as described.

2. In spark arresters, the combination With the stack and with the inverted cone screen therein, of a ring frame fastened to the upper end of said screen, a shifter rod secured at its upper end to one side of said ring frame and extending downwardly on the outside of said stack, means on the side of said stack for guiding'said shifter rod, a handle and a series of ln s at the lower end of said rod and means wlth which said lugs engage to hold the rod and screen in a plurality of different adjusted positions, substantially as described.

3. In spark arresters, the combination with the stack and with the inverted cone screen therein, of a ring frame fastened to rod, said hand the upper end of said screen, of a single shifter rod rigidly secured at its u per end to one side of said ring frame an extending downwardly on the outside of said stack, means on the side of said stack for guidin said shifter rod in straight line direction an for holding the same against rotation, a bracket at the base of the stack and a rotatable handle on the lower end of said rod having a series of lugs for engaging said bracket to hold the rod and screen at different heights, substantially as described.

4. In spark arresters, the combination with the stack and the cone screen therein, of a shifter-rod outside of said stack connected to said screen, a bracket at the base of the stack and a rotatable handle mounted in said bracket and engaging the lower end of said e having lugs for engaging said bracket to hold the screen at different heights, and said bracket having seats in its upper face to receive said lugs and slots to permit the passage of said lugs as the screen is raised. and lowered, substantially as described.

5. In spark arresters, the combination with the stack and with the inverted cone screen therein, of a ring frame fastened to the up er end of said screen, a shifter-rod secured at its upper end'to one side of said ring frame, means on the side of the stack for guiding said shifter-rod and for holding the same against rotation, a rotatable handle on the lower end of said rod and a bracket at the base of the stack, said handle having lugs engaging the bracket to hold the shifter-rod and screen at different heights and said bracket having slots through which said lugs pass as the screen is raised and lowered, substantially as described.

6. In spark arresters, the combination with the stack and the inverted cone screen therein, of a ring frame at the top of said stack to which said screen is connected, a shifter-rod connected at its up erend to one side of said ring frame, a gui e for said rod on the upper end of said stack holding the rod against rotation, a bracket at the lower end of said stack, and a rotatable handle in said bracket having a socket to receive said rod, said handle having lugs to engage the bracket and su port the screen at different heights and saic bracket having slots to permit the passage of said lugs, substantially as described.

WALLACE F. MAOGREGOR. Witnesses:

ELLIS J. Grr'rrNs, WILLIAM WALTER RAMSEY. 

